Jolie had family, friends and fans alarmed when in the recent months, she started looking extremely thin and frail.
But now, she's put on some weight again, and an insider said that it might be due to her pregnancy.
She also reportedly gave a sign at eldest son Maddox's sixth birthday party over the Aug 4 weekend, when she kept touching her stomach "absent-mindedly".
"Angie touched her belly absent-mindedly throughout the weekend. There was a definite protrusion from her belly," Life and Style quoted the source, as saying.
A friend of partner Brad Pitt also revealed that the actress has started taking care of herself.
"She finally got the message that people were worried and is taking care to eat well," the pal said.
If the news is true, then the impending arrival will be the fifth child for Brangelina, and their second biological child.